Act That Prepares the Crowd for the Main Performer

This page is the CodyCross answer for the clue below from Train Travel, Group 717, Puzzle 4 (Train Pushers).

Question is: Act That Prepares the Crowd for the Main Performer

and the answer is: WARMUP

Word Meaning:

WARM UP — (intransitive) To become warmer.

Definitions from Wiktionary.